SB2026102392 - Out-of-bounds write in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-99064)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause memory corruption and potentially a denial of service.

The vulnerability exists due to incorrect maintenance of cached IPv4 option offsets in cipso_v4_skbuff_delattr() when removing a CIPSO option that precedes other options. A remote attacker can send a specially crafted IPv4 packet to cause subsequent option processing to access incorrect bytes, potentially interpreting packet data as an option length and causing an out-of-bounds write into fixed-size option storage.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f
• https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b
• https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0
• https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3